Abstract
PCCS (Passive Containment Cooling System) is one of decay heat removal systems which run automatically after nuclear reactor core flooding case of LOCA (Loss of Coolant Accident). It is necessary for investigation of its cooling characteristics to evaluate the heat transfer coefficient on its cooling surface. For estimation of augmented heat transfer rate on the cooling surface, it is necessary to consider a contribution of drop-wise condensation on its heat transfer rate in addition to that of general film-wise condensation, which has been treated as some comparatively simple models. Purpose of this study is to measure droplet diameters and droplet number densities, which are parameters related to the drop-wise condensation heat transfer. The experimental set-up was constructed for evaluation of above parameters, which are referred to develop some correlation equations for the condensation heat transfer, hi this experiment, a air concentrations and surface subcooling degrees are varied within 0-25% and 5-20K respectively. Some images which show droplet behaviors are obtained for the above conditions, by using high-speed camera and Doughnut-arranged LED illuminations. And their behaviors are compared with that in some cases with existence of non-condensational gases.
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